Drive arrangement for false twisting devices



H. GASSNER 3,348,370

DRIVE ARRANGEMENT FOR FALSE TWISTING DEVICES Get. 24, 1967 OriginalFiled Feb. 23, 1960 INVENTOR Hons Gussner OINEYS mds m United StatesPatent 3,348,370 DRIVE ARRANGEMENT FOR FALSE' TWISTING DEVICES HansGassuer, 33 Friedhofstrasse, Schweinfurt, Germany Continuation ofapplication Ser. No. 10,326, Feb. 23, 1960. This application July 5,1966, Ser. No. 562,698 Claims priority, application (gel'many, Feb. 25,1959,

s clai nsfmif 57-7145 This' application is a continuation of my parentapplication Ser. No. 10,326, filed Feb. 23, 1-960, now abandoned.

This invention relates to a drive arrangement for false twisting devicesused for thecontinuous curling of synthetic filaments and comprisingtwisting tubes. There has already been suggested in'the prior art adrive arrangement for false twisting devices of this general type inwhich each twisting tube is so disposed in the vicinity of a magnet,preferably a'solen'oid, arranged behind a drive member such as a drivebelt or a drive pulley, that the lines of force of the stationary magnetwill hold the twisting tube in position in relation to the said drivemember and will urge the twisting tube against the drive member so thatthe twisting tube can be rotated by said drive member. The said twistingtube may be supported and guided by a fixedly mounted cage.

The present invention presents an improvement in a drive arrangement ofthis general type by providing for the twisting tube to be disposedbetween two unidirectionally drivable pairs of discs having their axesextending in parallel directions and with each of the opposed pairs ofdiscs being disposed in a common plane, the twisting tube being held inposition and at the same time urged against the peripheries of the twopairs of drive discs by the lines of force of a stationary magnet,preferably an electro-magnet.

This drive arrangement according to the present invention affordsimportant advantages. Firstly, the lines of force of the magnet holdingthe twisting tube in position will no longer be weakened by a structuralmember such as a drive belt disposed between the magnet and the twistingtube. Secondly, it is possible, according to the present invention, todispose the magnet at a very small distance from the twisting tube.Where the pairs of drive.

discs are driven at a rate of, say, 2500 r.p.m., the discs having adiameter of about 12 inches (300 mm.), the twisting tubes having adiameter of, for example, 73 in. (8 mm.), will rotate at as high a speedas 100,000 r.p.m. From this it will be understood that it will not bedifficult to attain rotary speeds ranging from 100,000 to 200,000 r.p.m.or even considerably higher, without the bearings of the drive discsbeing subjected to stresses exceeding those presently known to occur inspinning spindles and the like. Furthermore, the twisting tubes requireno anti-friction or journal bearings and can therefore be manufacturedat considerably lower cost, and moreover the twisting tubes require noattention during operation. The use of electro-magnets for theaforeindicated purpose is preferred because they permit any desiredmagnetic forces of attraction to be produced.

According to the present invention, the pairs of discs driving thetwisting tubes are disposed in a common plane in relation to oneanother.

Other objects and features of the invention will become apparent as thedescription proceeds, especially when taken in conjunction with theaccompanying drawing, illustrating a preferred embodiment of the presentinvention, wherein:

FIG. 1 is a diagrammatic side elevational view of a drive arrangementaccording to the present invention; and

FIG. 2 is a plan view of the embodiment of FIG. 1.

3,348,370 Patented Oct. 2 1, 197

In the embodiment of FIGS. 1 and 2, the drive arrangement includes twopairs of drive discs 1 'and2, the axles 11 and 12 of the two pairs ofdiscs extending in. parallel directions, and the'discs 1 and 2 of eachpair being disposed in a common plane, the, discs being driven to rotatein the same direction. Disposed between the twopairs of drive discs aretwo twisting tubes 3 and 4 having no fixed bearings, each twisting tubebeingpro'vided with two collars 5 and 6. Two fixedly mountedelectro-magnets T and '8 are provided, one electro-magnet beingassociated with each of the twisting tubes 3 and 4. Thecollars 5 and 6of each twisting tube are disposed opposite the pole pieces 9 and 10respectively of the electro-magnets. In'this manner, the twisting tube"is guided in axial as well as radialdirections by the lines of force ofthe electro magnet and is brought into frictional contact with the pairsof drive discs 1, 2. The pairs of drive discs'are carried by shafts 11and 12 which are driven by belt means 13. It will be understood,however, thatthe said shafts may be driven in any other suitable manner.

As described thus far, both of thetwo associated pairs of drive discsare arranged to be positively driven. However, it is also possible toprovide for only one pair of drive discs, for example the pair 1, to bedriven in rotation and to cause the respective other pair of drivediscs, i.e. the pair 2, to idle and thus to serve the function of guidediscs. To still further improve the running characteristics, theperipheries of one or both of the pairs of drive discs may be coveredwith a material having a high coefiicient of friction, such as rubberfor example. Where at least the collars 5, 6 of the twisting tubes aremade of a magnetic material, the twisting tubes themselves may be madeof a non-magnetic material.

What is claimed is:

1. A device for imparting a false twist to synthetic filaments in acontinuous operation, said device comprising a twisting tube memberhollow throughout for the passage therethrough of the synthetic filamentto be false twisted and adapted for rotation, two pairs of rotatabledrive discs mounted for rotation on parallel axes, the opposed discs ofeach pair being disposed in a common plane, drive means forunidirectionally driving said drive discs, and a bipolar magnet fixedlydisposed between said pairs of drive discs with both poles of saidmagnet being disposed in close proximity to said twisting tube member,said twisting tube member consisting at least partially of magneticmaterial and being held in position and urged into frictional contactwith the peripheries of said pair of drive discs in the nip thereof bythe magnetic force lines of said magnet, with the twisting tube memberbeing driven by the said drive discs.

2. A device for imparting a false twist to synthetic filaments in acontinuous operation, said device comprising a twisting tube memberhollow throughout for the passage therethrough of the synthetic filamentto be false twisted and adapted for rotation, two pairs of rotatabledrive discs mounted for rotation on parallel axes, the opposed discs ofeach pair being disposed in a common plane, drive means forunidirectionally driving said drive discs, and a bipolar magnet fixedlydisposed between said pairs of drive discs with both poles of saidmagnet being disposed in close proximity to said twisting tube member,said twisting tube member comprising non-magnetic material and alsocomprising two collars of magnetic material disposed opposite therespective pole pieces of said magnet and close to the inner surface ofsaid discs, sa d twisting tube member being held in position and urgedinto frictional contact with the peripheries of said pairs of drivediscs in the nip thereof by the magnetic force lines of said magnet,with the twisting tube member being driven by the said drive discs.

3. Apparatus for false twisting textile yarns, which comprises a pair ofrollers each comprising a pair of discs, at least one of which rollersis driven, the rollers being spaced one from the other to form a crotchbetween their respective discs, an elongated twisting tube hollowthroughout for the passage therethrough of the textile yarn to be falsetwisted and having its ends extending beyond said discs and positionedin said crotch in frictional engagement with the peripheral edges ofsaid discs, and bipolar magnetic means acting on said twisting tube formaintaining the same in said position and in said frictional engagement,both poles of said bipolar magnetic means being disposed in closeproximity to said elongated twisting tube, the respective discs of saidrollers being disposed in the same plane with respect to each other.

4. The combination of claim 3, wherein two twisting tube members, eachhaving a bipolar magnet associated therewith, are separately disposed inthe hips formed by the said pairs of discs.

5. The combination of claim 3, wherein the said discs are made of anon-magnetic material.

6. The combination of claim 3, wherein the peripheral surfaces of thesaid discs are covered with a material having a high coeflicient offriction.

7. The combination of claim 3, wherein both pairs of discs arepositively driven by drive means.

8. The combination of claim 3, wherein only one pair of discs isarranged to be driven in rotation, the other of the two pairs beingarranged to idle and to serve the function of a pair of guide discs.

References Cited UNITED STATES PATENTS OTHER REFERENCES Japanesepatentapplication publication No. 32/ 10379 Dec. 12, 1957. M I'OHN PETRAKES,Primary Examiner.

